Salix exigua var. exigua

Common names: Narrow-leaf or coyote willow
IllustratedEndemic
Synonyms: Salix argophylla Nuttall Salix exigua var. luteosericea (S. Watson) C. K. Schneider Salix exigua var. nevadensis (Rydberg) C. K. Schneider Salix exigua var. stenophylla Rowlee Salix exigua var. virens (Nuttall) Sargent Salix fluviatilis var. argophylla (Andersson) C. K. Schneider Salix hindsiana var. tenuifolia (Nuttall) Andersson Salix longifolia var. argophylla Andersson Salix longifolia var. opaca Salix luteosericea Salix nevadensis Salix stenophylla
Treatment appears in FNA Volume 7. Treatment on page 55. Mentioned on page 56, 57, 59.

Shrubs or trees, 0.5–5 (–10) m. Stems: branches yellowbrown to redbrown; branchlets yellowish, yellowbrown, or redbrown, puberulent, densely short-silky-tomentose or short-silky-villous, hairs appressed, sometimes few spreading. Leaves: stipules absent or rudimentary on early ones, foliaceous on late ones; petiole pubescent adaxially; largest medial blade lorate, 30–136–143 × 2–8 mm, 10–16–28 times as long as wide, abaxial surface densely silky-villous or pilose, hairs appressed or spreading, straight or wavy, adaxial sparsely long-silky to glabrescent; juvenile blade very densely long-silky abaxially (hairs usually appressed, sometimes a few spreading). Catkins: staminate 13–54 × 2–10 mm, flowering branchlet 1.5–16 mm; pistillate loosely flowered, slender or stout, 14.5–70 × 4–12 mm, flowering branchlet 2–16 mm; floral bract 1.2–1.6 mm, apex rounded, entire, abaxially hairy (or glabrate), hairs wavy or straight. Staminate flowers: abaxial nectary 0.2–0.8 mm, adaxial nectary oblong, 0.3–0.8 mm; anthers 0.5–1 mm. Pistillate flowers: adaxial nectary oblong or ovate, 0.3–0.9 mm shorter than stipe; stipe 0.2–0.9 mm; ovary obclavate, usually glabrous, sometimes beak pilose, beak bulged below or abruptly tapering to styles; ovules 13–30 per ovary; styles 0–0.2 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.3–0.5 mm. 2n = 38.


Phenology: Flowering early Mar-late Jun or mid Jul.
Habitat: Riparian, bars and shores of streams and lakes, silty, sandy, or gravelly substrates
Elevation: 600-2800 m

Distribution

V7 47-distribution-map.gif

Alta., B.C., Ariz., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., Okla., Oreg., Tex., Utah, Wash., Wyo.

Discussion

Hybrids:

Variety exigua forms natural hybrids with var. hindsiana, Salix columbiana, S. interior, and S. melanopsis.

Variety exigua × var. hindsiana was reported by R. D. Dorn (1998). Inasmuch as the two varieties are subtly distinct, hybrids are difficult to recognize.

Variety exigua × Salix interior probably occurs throughout their area of overlap; it is known to me from Alberta and Nebraska, where there are plants with leaves indistinctly toothed and more silky than in S. interior. R. D. Dorn (1998) reported it from Alberta, British Columbia, Colorado, Montana, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming.

Variety exigua × Salix melanopsis is intermediate, with juvenile leaves densely hairy proximally, truncate floral bracts, and prominent stipules (R. D. Dorn 1998).

Selected References

None.

Lower Taxa

None.

"-143mm" is not declared as a valid unit of measurement for this property.

... more about "Salix exigua var. exigua"
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
pilose +  and silky-villous +
ovate +  and oblong +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
sparsely long-silky;glabrescent +
reddish turning yellow +  and yellow +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
erose +  and entire +
George W. Argus +
Nuttall +
cuneate +
Longifoliae +
tapering +
yellowish green +
toothed +  and 2-fid +
deciduous +
yellowbrown +  and redbrown +
tomentose +  and glabrescent +
short-silky-villous +, short-silky-tomentose +  and puberulent +
stout +  and slender +
0.2 cm2 mm <br />0.002 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
flowered +, pistillate +  and staminate +
1.45 cm14.5 mm <br />0.0145 m <br /> (7 cm70 mm <br />0.07 m <br />) +
pendulous +, spreading +  and erect +
stout +  and slender +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Narrow-leaf or coyote willow +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nebr. +, Nev. +, N.Mex. +, Okla. +, Oreg. +, Tex. +, Utah +, Wash. +  and Wyo. +
600-2800 m +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Riparian, bars and shores of streams and lakes, silty, sandy, or gravelly substrates +
straight +
spreading +  and appressed +
glabrate +  and hairy +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
6.5-28(-37.5) +
30mm;136-143mm +
lorate +  and linear +
0.2 cm2 mm <br />0.002 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
spinulose-serrulate +  and entire +
2-7[-10]-carpellate +
obclavate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
glandular-dotted +
flat;convex +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering early Mar-late Jun or mid Jul. +
N. Amer. Sylv. +
overlapping +
distinct +
Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
tapering +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
persistent +  and deciduous +
Salix argophylla +, Salix exigua var. luteosericea +, Salix exigua var. nevadensis +, Salix exigua var. stenophylla +, Salix exigua var. virens +, Salix fluviatilis var. argophylla +, Salix hindsiana var. tenuifolia +, Salix longifolia var. argophylla +, Salix longifolia var. opaca +, Salix luteosericea +, Salix nevadensis +  and Salix stenophylla +
Salix exigua var. exigua +
Salix exigua +
variety +
rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +